Screw driver



mam El KV mm P m sum .m A l Oct. 16, 1928.

I INVENTOR.

5 v ATTORNEY,

Patented Get. 16, 1 92 8.

ABRAHAM s. PINKUS, on NEW YORK, N. 'Y,

' scanw DRIVER.

Application filed November 3, 1925. Serial No. 66,656.

' This invention relates-to screwdrivers and more particularly toscrewdrivers of the clutch type in which a clutch is provided iorholding the screw while it is screwed nto place, or for holding thescrew asit is withdrawn. An object of the invention is the provision oia clutch for the screw head which may be engaged or released by theaction of the fingers of the hand which operates the device, anotherobject is to secure the automatic release of the screw from the clutchand another object is to provide means for operating the clutch by themovement of the outer sleeve relative to the handle. Other objects ofthe invention will appear from the following specification and theaccompanying drawings, in which, Fig. l, is a screwdriver V embodying myinvention, Fig. 2 corresponds to Fig. 1, with the handle shown 1nsection,

Fig. 3 is an-enlarged view of the interior with'certain parts shown insection, Fig. 4 is a cross-section of the handle on the line 1212 ofFig. 3, and Fig. 5 is a cross-section.

of the shank on the line 1313 of Fig. 2. j

The present invention comprises a screwdriver bit with a plurality ofclutch springs extending lon itudinally therewith and enclosed in atubular sleeve. The bitIis movable longitudinally relative to the handlebut is. secured to rotate with. the handle. clutch springs do not movelongitudinally relative to the handle, but the outer sleeve is movablelongitudinally relative to the handle and this sleeve may rotateindepend ently of the other parts; The relative longitudinal motionbetween the sleeve and the clutch sprin s operates the clutch and, asthe sleeve is moved by a'finger grip, it is apparent that the clutch ismanipulated from the handle. The longitudinal motion of the'bit Isopposed by a spring and so arranged that when the clutch is released,thebit automat1- cally discharges the screw. The fiat end en- EZZL iH thescrew is u 3-set fromthe lon itudit) O 23 nal shank which engagesthehandle, this end has a shoulder which, normally is engaged by the clutchmembers and whenin thisposition the device is used as an ordinary screwdriver. g

The preferred form of my invention is shown in the drawings in which theshank is indicated by 51, the handle by 52, the fer- The rule by 53 andthe finger grip by'the disc 54.

longitudinal centre of the handle. The stem' of the bit 61 is made fromround stock and at the inner end is fitted with a square sleeve62 whichis secured thereto by the'pin 63. This .sleeve' slides in the centralaperture in 64 and r is projected b the spring 65. Thusth'e bit has alongitu inal movement relative to the handle while it is rotated by thehandle and has a normally projected position.

The sleeve 51 has a flange 7 3 at the inner end which engages the spring72 in the hol low handle. This sleeve can thus be moved relative to thehandle to release the jaws 56 of the clutch as indicated in Fig. 2 whilethe spring 72 tendsto move the sleeve to the position which holds theclutch jaws closed.

The clutch jaws are formed from springs 66, 67, 68 and 69 which areformed in the'arc of a circle as indicated in the cross-section. in IFig. 5 so as to align with: the tubular form of the instrument. Theinner ends of these springs are turned over as indicated'at 71, Fig. 3to engage the washer 70 which is engaged by the spring 72. I e

Inassembling it will be noted that the clutch springs are inserted insleeve 51 from the outer end, spring 72 and washer 70 are then placed,the stem 61 of the bit is'inserted from the. outer end andthe squareblock 62 is riveted to this end when it is in place. This block preventsthe washer 70 and the springs 66,67, 68'and 69 from being displaced atthe inner end'and the entire device is thus ready to insert inthe handlewhere it is held by the ferrule 53. engaging the flange 73.

In this construction it should be noted that the sleeve 51 is free torotate as well' as to slide in the handle. This sleeve may, thus, befirmly held while the device is put to its intended use. Where desiredthe springs 66, 67, 68 and 69 may be made of a tube slit at the end toform jaws.

Having thus. described my invention, I claim:

In a screwdriver of the class described, the

combination, ahandle, a tnbnlar sleeve having one end slidably insertedin said handle, a

shank formed in a bit at one end and spring fingers having inturned endsaoent said bit slidably inserted with said [shank in said sleeve, saidspring lingers forming jaws'con trolled by said sleeve for holding ascrew in alignment With said bit, a ferrule on said handle resisting theoutward inovenient'o f weaves secured to the end of said shankniakingnon-turning engagement with said handle whereby said bit is operated bythe handle.

Signed at New York in the county of New York and State of New York this27th day of October, A. D1925.

ABRAHAM S. PINKUS.

